Control statements in c

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1. OPERATOR & CONTROL STATEMENT IN ‘C’

2. Operator:- C supports a rich set of operators. Operator is a symbol that tells computer to perform certain mathematical and logical manipulations .

3. Types of operator Arithmetic operator Relational operator Logical operator Assignment operator Unary operator Conditional operator Bitwise operator

4. Arithmetic operator:- Arithmetic operator are used for mathematical calculation these operator are binary operator that work with integer floating point number and every character . Arithmetical operator are: Operator Meaning + Addition - Subtraction * Multiplication / Division % Module division :

5. Relational operator: - Relational operator are used to compare two operands. Operands may be variable, constant or expression . Operator Meaning < Is less than <= Is less than equal to > Is greater than >= Is greater than equal to == Equal to != is not equal to

6. Example of Relational operator :- main() { int a=10,b=20,c=30,d,e; d=a>b; e=b<=c; printf(“%d %d”,d,e); getch(); } Output:- 0 1

7. Logical operator:- Are used to combine (compare) two or more condition. Logical Operator are:- Operator Meaning && Logical AND || Logical OR ! Logical NOT

8. Types of operator:- Logical AND compare two operands and return 1if both condition are true else return 0 (false) Logical OR compare two operand and return 1 if any one condition true. Example:- Condition AND OR 1 1 1 1 1 1 1 1 Logical NOT if the condition is true result is false and if the condition is false result true . Example:- Condition NOT 1 1

9. Assignment Operators:- Assignment operator are used to assign the value or an expression or a value of a variable to another variable a 8 = variable Expression Assignment operator

10. UNARY Operator:- Unary operator is also called Increments & decrement operator. The increment operator ( ++ ) adder on to the variable and decrement ( - - ) subtract one from the variable. There are following unary operator Operator Meaning ++x Pre increment - -x Pre decrement x++ Post increment X- - Post decrement

11. Conditional Operator:- The conditional operator is ternary operator, which operates On the three operands. Example:- main() { int a=10,b=5,big; big=a>b ? a:b; printf(“Big is %d”,big); getch(); } Output is:- 10

12. Bitwise Operator:- Are used by the programmer to communicate directly with the hardware.These operator are used for designing bit or shifting them either right to left, left to right. Example:- Operator Meaning & Bitwise AND | Bitwise OR ^ Bitwise XOR << Left shift >> Right shift

13. Equality operator:- Equality operator is used for compression between two operands these operator. Example:- Operator Meaning == Equal to != Not equal to

14. Control Statement ?

15. There are three types of statement:- Control statement

16. Decision Control statement: - Decision control statement disrupt or alter the sequential execution of the statement of the program depending on the test condition in program Types of Decision control statement:-

17. If statement : The If statement is a powerful decision making statement and is used to control the flow of execution of statement. condition Block of if Next statement STOP FALSE TRUE

18. Example of IF statement main() { int a; printf(“enter value of a”); scanf(“%d”,&a); if(a>25) { printf(“no.is greater than 25”); } printf(“\n bye”); getch(); }

19. If else statement:- condition Block of if Next statement STOP FALSE TRUE Block of else If the condition is true the true block is execute otherwise False block is execute.

20. Example of If else statement main() { int n,c; printf(“\n enter value of n”); scanf(“%d”,&n); c=n%2; if(c==0) printf(“no is even”); else printf(“no is odd”); getch(); }

21. What Is Else If Ladder:  If we are having different - different test conditions with different - different statements, then for these kind of programming we need else if ladder Syntax Of Else If Leader: ---------------------------------------------------------------------   if(test_condition1)     {        statement 1;      }  else if(test_condition2)     {        statement 2;      }    else if(test_condition3)     {        statement 3;      }  else if(test_condition4)     {        statement 4;       } e lse { }

22. void main ( ) { int num = 10 ; if ( num > ) printf ( " \n Number is Positive " ) ; else if ( num < ) printf ( " \n Number is Negative " ) ; else printf ( " \n Number is Zero " ) ; }

23. Depending on the position of control statement in c,control structure may be classified Entry_ controlled loop Exit _controlled loop

24. False true Entry controlled loop exit controlled loop Test condition ? Body of the loop Body of the loop Test condition ?

25. C language provides three constructs for perfoming loop operations While statement Do statements For statements

26. While(test condition) { body of the loop }

27. ……………………… ……………………… int_sum =0; int_n =1; while( int_n <=10) { int_sum = int_sum+int_n ; int_n =int_n+1; } printf (“sum=%d\ n”,int_sum ); …………………………………………..

28. Do statement do { Body of the loop } While(test condition )

29. int_i =1; int_sum =0; do { int_sum = int_sum+I i =i+2; } while(sum<40|| i <10); printf (“%d %d\ n,I,sum );

30. For statements For( intialization;testcondition;icrement ) { body of the loop }

31. Intialization of control variable done first using assignment statement The value of control variable tested using test condition,ie reletional expression such as i >10,that determine when the loop will exit If the condition is true ,the body of loop executed,otherwise terminated

32. int_sum =0; for( int_n =1;int_n<=10;int_n++) { int_sum = int_sum+int_n ; } printf (“sum=%d\ n”,int_sum );

33. Nesting of for loop For( i =0;i< n;i ++) { ……………………………… For(j=0;j<n-1;j++) { ……………………………… } }

34. Jumping out of a loop Exit from a loop using break statement if a break statement encounteredd in a loop,the loop will immidiatly exited and the program continues with the statement immidiatly following loop;ie break will exit only a single loop

35. Eg : while(test condition) { …………………………….. ……………………………… if(condition) break;

36. Skipping a part of loop Another statement ‘continue’, It tells the compiler skip the following statements and continue with next iteration Eg : While (test condition) { ……………………….. If(…………) Continue;

37. Switch statement Switch statement is a multi-way decision making statement which selects one of the several alternative based on the value of integer variable or expression . Syntax :- switch(expression) { case constant : statement; break; default : statement; }

38. Example of switch statement main() { char choice; printf (“enter any alphabet”); scanf (“%d”,& choice); switch(choice) { case ‘a’ : printf (“this is a vowel \n”); break; case ‘e’ : printf (“this is a vowel \n”); break; case ‘ i ’ : printf (“this is a vowel \n”); break; case ‘o’ : printf (“this is a vowel \n”); break; case ‘u’ : printf (“this is a vowel \n”); break; default : printf (“this is not a vowel”); getch (); } }

39. Go To statement A GO TO statement can cause program control to end up anywhere in the program unconditionally . Example :- main() { int i=1; up : printf(“Hello To C”) i++; If (i<=5) goto up getch(); }